Cách sử dụng
When we say "all at once", we mean that something happens suddenly, quickly, or all together. For example, if you have many things to do and you decide to do them all at once, it means you want to complete all of them in a short period of time. Another example could be when you hear a loud noise, and you realize all at once that the power has gone out, your phone isn't working, and you can't hear anything. So, "all at once" means that everything happens together, suddenly, or quickly.